<template>
  <div>
    <!-- 面包屑导航区 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 头部的警告区域 -->
      <el-alert title="注意：只允许为第三级分类设置相关参数!" type="warning" :closable="false" show-icon></el-alert>
      <!-- 选择商品分类区域 -->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类:</span>
          <!-- 选择商品分类的级联选择框 -->
          <el-cascader
            expand-trigger="hover"
            v-model="selectedCateKeys"
            :options="catelist"
            :props="cateProps"
            @change="handleChange"
          ></el-cascader>
        </el-col>
      </el-row>
      <!-- tab 页签区域 -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!-- 添加动态参数的面板 -->
        <el-tab-pane label="动态参数" name="many">
          <!-- 添加参数的按钮 -->
          <el-button
            type="primary"
            size="mini"
            :disabled="isBtnDisabled"
            @click="addDialogVisible=true"
          >添加参数</el-button>
          <!-- 动态参数表格 -->
          <el-table :data="manyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
                <template slot-scope="scope">
                  <!-- 循环渲染Tag标签 -->
                    <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i, scope.row)">{{item}}</el-tag>
                    <!-- 输入的文本框 -->
                    <el-input
                        class="input-new-tag"
                        v-if="scope.row.inputVisible"
                        v-model="scope.row.inputValue"
                        ref="saveTagInput"
                        size="small"
                        @keyup.enter.native="handleInputConfirm(scope.row)"
                        @blur="handleInputConfirm(scope.row)"
                      >
                      </el-input>
                      <!-- 添加的按钮 -->
                    <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button size="mini" type="primary" icon="el-icon-edit" @click="showRditDialog(scope.row.attr_id)">编辑</el-button>
                <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!-- 添加静态属性的面板 -->
        <el-tab-pane label="静态属性" name="only">
          <!-- 添加属性的按钮 -->
          <el-button
            type="primary"
            size="mini"
            :disabled="isBtnDisabled"
            @click="addDialogVisible=true"
          >添加属性</el-button>
          <!-- 静态属性表格 -->
          <el-table :data="onlyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
                <template slot-scope="scope">
                  <!-- 循环渲染Tag标签 -->
                    <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i, scope.row)">{{item}}</el-tag>
                    <!-- 输入的文本框 -->
                    <el-input
                        class="input-new-tag"
                        v-if="scope.row.inputVisible"
                        v-model="scope.row.inputValue"
                        ref="saveTagInput"
                        size="small"
                        @keyup.enter.native="handleInputConfirm(scope.row)"
                        @blur="handleInputConfirm(scope.row)"
                      >
                      </el-input>
                      <!-- 添加的按钮 -->
                    <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column label="属性名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button size="mini" type="primary" icon="el-icon-edit"  @click="showRditDialog(scope.row.attr_id)">编辑</el-button>
                <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>

    <!-- 添加参数的对话框 -->
    <el-dialog :title="'添加' + titleText" :visible.sync="addDialogVisible" width="50%" @close="addDialogClosed">
      <el-form
        :model="addForm"
        :rules="addFormRules"
        ref="addFormRef"
        label-width="100px"
      >
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParam">确 定</el-button>
      </span>
    </el-dialog>
    

    <!-- 修改参数对话框 -->
    <el-dialog :title="'修改' + titleText" :visible.sync="editDialogVisible" width="50%" @close="editDialogClosed">
      <!-- 添加参数的对话框 -->
      <el-form
        :model="editForm"
        :rules="editFormRules"
        ref="editFormRef"
        label-width="100px"
      >
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParam">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>


<script>
export default {
  data() {
    return {
      //   商品分类列表
      catelist: [],
      //   级联选择框的配置对象
      cateProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      //   级联选择框双向绑定的数组
      selectedCateKeys: [],
      //   被激活页签的名称
      activeName: 'many',
      //   动态参数的数据
      manyTableData: [],
      // 静态参数的属性
      onlyTableData: [],
      //   控制添加对黄框的显示与隐藏
      addDialogVisible: false,
    //   添加参数的表单数据对象
    addForm:{
        attr_name: ''
    },
    // 添加表单的验证规则对象
    addFormRules:{
        attr_name:[
            { required: true, message: '请输入参数名称', trigger: 'blur' }
        ]
    },
    // 控制修改对话框的显示与隐藏
    editDialogVisible: false,
    // 修改表单数据对象
    editForm: {},
    // 修改表单有的验证规则对象
    editFormRules:{
        attr_name:[
            { required: true, message: '请输入参数名称', trigger: 'blur' }
        ]
    }
  
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    //   获取所有的商品分类列表
    async getCateList() {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类失败')
      }

      this.catelist = res.data
      console.log(this.catelist)
    },
    // 级联选择框选中项变化，会触发这个函数
    handleChange() {
      this.getParamsData()
    },
    // tab 页签 点击事件的处理函数
    handleTabClick() {
      console.log(this.activeName)
      this.getParamsData()
    },

    // 获取参数的列表数据
    async getParamsData() {
      // 证明选中的不是三级分类
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = []
        this.manyTableData = []
        this.onlyTableData = []
        return
      }
      // 证明选中的是三级分类
      console.log(this.selectedCateKeys)
      //   根据所选分类的Id， 和当前所处的面板， 获取对应的参数
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes`,
        { params: { sel: this.activeName } }
      )

      if (res.meta.status !== 200) {
        return this.$message.error('获取参数列表失败')
      }

      
        res.data.forEach(item => {
            item.attr_vals =item.attr_vals ? item.attr_vals.split(' ') : []
            
            // 控制文本框的显示与隐藏
            item.inputVisible = false
            // 文本框中的输入值
            item.inputValue = ''

        })
        console.log(res.data)

      if (this.activeName === 'many') {
        this.manyTableData = res.data
      } else {
        this.onlyTableData = res.data
      }
    },
    // 监听对话框的关闭事件
    addDialogClosed() {
        this.$refs.addFormRef.resetFields()
    },
    // 点击按钮，添加参数
     addParam() {
        this.$refs.addFormRef.validate( async valid => {
            if(!valid) return
           const {data: res} = await this.$http.post(`categories/${this.cateId}/attributes`, {attr_name: this.addForm.attr_name, attr_sel: this.activeName})
           if(res.meta.status !== 201) {
               return this.$message.error('添加参数失败')
           }
           this.$message.success('添加参数成功')
           this.addDialogVisible = false
           this.getParamsData()
        })
        
    },
    // 点击按钮展示修改的对话框
     async showRditDialog(attr_id) {
        //  查询当前参数的信息
        const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`, {params: {attr_sel: this.activeName}})
        if(res.meta.status !== 200) {
            return this.$message.error('获取参数信息失败')
        }
        this.editForm = res.data
         this.editDialogVisible= true
     },
    //  重置修改的表单
     editDialogClosed() {
         this.$refs.editFormRef.resetFields()
     },
    //  点击按钮修改参数信息
      editParam() {
         this.$refs.editFormRef.validate(async valid => {
             if(!valid) return
             const {data: res} =await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`, {attr_name: this.editForm.attr_name, attr_sel: this.activeName})
             if(res.meta.status !== 200) {
                 return this.$message.error('修改参数失败')
             }
             this.$message.success('修改参数成功')
             this.getParamsData()
             this.editDialogVisible =false
         })
     },
    //  根据id删除对应的参数项
     async removeParams(attr_id) {
        const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).catch(err => err)

        // 用户取消了删除的操作
        if(confirmResult !== 'confirm') {
            return this.$message.info('已取消删除')
        }
        // 删除的业务逻辑
        const {data: res} =await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)
        if(res.meta.status !== 200) {
            return this.$message.error('删除参数失败')
        }
        this.$message.success('删除参数成功')
        this.getParamsData()
     },
    //  文本框失去了焦点， 或摁下了 enter键都会触发
     async handleInputConfirm(row) {
       if(row.inputValue.trim().length === 0) {
         row.inputValue = ''
         row.inputVisible = false
         return
       }
      //  如果没有return， 则证明输入的内容， 需要做后续处理
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false
      // 需要发起请求， 保护这次操作
        this.saveAttrVals(row)
       
     },

    //  将对attr_vals的操作， 保存到数据库
     async saveAttrVals(row) {
        // 需要发起请求， 保护这次操作
      const {data: res } = await this.put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
        attr_name: row.attr_name,
        attr_sel: attr_sel,
        attr_vals: row.attr_vals.join(' ')
      })
       if(res.meta.status !== 200) {
         return this.$message.error('修改参数项失败')
       }
       this.$message.success('修改参数成功')
     },
    //  点击按钮， 展示文本输入框
     showInput(row) {
       row.inputVisible = true
       //  让文本框自动获得焦点
      //  $nextTick  方法的作用， 就是当页面上的元素被重新渲染之后， 才会指定回调函数中的代码
       this.$nextTick(_ => {
          this.$refs.saveTagInput.$refs.input.focus();
        });
     },
    //  删除对应的参数可选项
    handleClose(i, row) {
      row.attr_vals.splice(i, 1)
      this.saveAttrVals(row)
    }
    
  },


  computed: {
    // 如果按钮被禁用则返回true   否则返回false
    isBtnDisabled() {
      if (this.selectedCateKeys.length !== 3) {
        return true
      }
      return false
    },
    //  当前选中的三级id
    cateId() {
      if (this.selectedCateKeys.length === 3) {
        return this.selectedCateKeys[2]
      }
      return null
    },
    // 动态计算标题的文本
    titleText() {
      if (this.activeName === 'many') {
        return '动态参数'
      }
      return '静态属性'
    }
  }
}
</script>
   

<style lang="less" scoped>
.cat_opt {
  margin: 15px 0;
}


.l-tag{
  margin: 10px;
}


.input-new-tag {
  width: 120px;
}
</style>